[doc] add consultancy link to readme

Author: tgalal

README.md

@@ -2,6 +2,8 @@
 
 <a href="https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=Z9KKEUVYEY6BN" target="_blank"><img src="https://www.paypalobjects.com/en_US/i/btn/btn_donate_LG.gif" /></a>
 
+**For private consultancy feel free to directly schedule it over [codementor](https://www.codementor.io/@tgalal).**
+
 ---
 
 yowsup is a python library that enables building applications that can communicate with WhatsApp users.